MIC809/MIC810
Microprocessor Reset Circuits
Features
General Description
• Precision Voltage Monitor for 3V, 3.3V, or 5V
Power Supplies
• /RESET Remains Valid with VCC as Low as 1.4V
for the SOT-23
• /RESET Remains Valid with VCC as Low as 1V for
the SC-70
• Typically Less Than 15 µA Supply Current for the
SOT-23
• 5 µA Typical Supply Current for the SC-70
• 140 ms Minimum Reset Pulse Width Available
• Available in 3-Lead SOT-23 and SC-70 Packages
The MIC809 and MIC810 are inexpensive
microprocessor supervisory circuits that monitor power
supplies in microprocessor-based systems.
Applications
•
•
•
•
•
Portable Equipment
Intelligent Instruments
Critical Microprocessor Power Monitoring
Printers/Computers
Controllers
The function of these devices is to assert a reset if the
power supply drops below a designated reset threshold
level. Several different reset threshold levels are
available to accommodate 3V, 3.3V, or 5V powered
systems.
The MIC809 has an active-low /RESET output, while
the MIC810 offers an active-high RESET output. The
reset output is guaranteed to remain asserted for a
minimum of 140 ms after VCC has risen above the
designated reset threshold level. Having a push-pull
output stage, the MIC809/810 do not require a pull-up
resistor at the output. The MIC809/810 come in a
3-lead SOT-23 and SC-70 package.
The MIC809 is also available with a shorter reset
timeout (30 ms, minimum).
Package Types
MIC809
3-Lead SOT-23 (U)
3-Lead SC-70 (C3)
(Top View)
2022 Microchip Technology Inc. and its subsidiaries
MIC810
3-Lead SOT-23 (U)
3-Lead SC-70 (C3)
(Top View)
DS20006707A-page 1
MIC809/MIC810
Typical Application Circuit
Functional Block Diagram
DS20006707A-page 2
2022 Microchip Technology Inc. and its subsidiaries
MIC809/MIC810
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Terminal Voltage (VCC).............................................................................................................................. –0.3V to +6.0V
Input Current (VCC, /MR).........................................................................................................................................20 mA
Output Current (/RESET, RESET) ..........................................................................................................................20 mA
Rate of Rise (VCC) ............................................................................................................................................... 100V/µs
ESD Rating, SC-70 (Note 1) ...................................................................................................................................... 3 kV
Operating Ratings ‡
Power Dissipation (TA = +70°C)...........................................................................................................................320 mW
† Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at those or any other conditions above those indicated
in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended
periods may affect device reliability.
‡ Notice: The device is not guaranteed to function outside its operating rating.
Note 1: Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5 kΩ in series
with 100 pF.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics: For typical values, VCC = 5V for MIC8__L/M/J, VCC = 3.3V for MIC8__S/T, VCC = 3V for
MIC8__R; TA = +25°C, bold values valid for –40°C to ≤ TA ≤ +85°C; unless noted. (Note 1)
Parameter
Operating Voltage Range
Supply Current
Reset Voltage Threshold
Reset Timeout Period
Note 1:
Symbol
VCC
ICC
VTH
tRST
Min.
Typ.
Max.
Units
Conditions
1.4
—
5.5
1.6
—
5.5
1.0
—
5.5
TA = –40°C to 85°C (SC-70)
—
9
15
MIC809L/M/J, MIC810L/M/J
(SOT-23)
—
5
15
MIC809L/M/J, MIC810L/M/J
(SC-70)
TA = 0°C to 70°C (SOT-23)
V
µA
TA = –40°C to 85°C (SOT-23)
—
6
10
VCC < 3.6V, MIC809R/S/T,
MIC810R/S/T (SOT-23)
—
5
10
VCC < 3.6V, MIC809R/S/T,
MIC810R/S/T (SC-70)
4.50
4.63
4.75
MIC809L, MIC810L
4.25
4.38
4.50
MIC809M, MIC810M
3.89
4.00
4.10
3.00
3.08
3.15
2.85
2.93
3.00
MIC809S, MIC810S
2.55
2.63
2.70
MIC809R, MIC810R
140
240
560
V
ms
MIC809J, MIC810J
MIC809T, MIC810T
—
Specification for packaged product only.
2022 Microchip Technology Inc. and its subsidiaries
DS20006707A-page 3
MIC809/MIC810
ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Characteristics: For typical values, VCC = 5V for MIC8__L/M/J, VCC = 3.3V for MIC8__S/T, VCC = 3V for
MIC8__R; TA = +25°C, bold values valid for –40°C to ≤ TA ≤ +85°C; unless noted. (Note 1)
Parameter
/RESET Output Voltage
(MIC809)
/RESET Output Voltage
(MIC809)
Symbol
VOH
VOL
RESET Output Voltage
(MIC810)
VOH
RESET Output Voltage
(MIC810)
VOL
Note 1:
Min.
Typ.
Max.
Units
VCC –
1.5V
—
—
0.8 x
VCC
—
—
ISOURCE = 500 μA, MIC809R/S/T
—
—
0.4
VCC = VTH (minimum),
ISINK = 3.2 mA, MIC809L/M/J
—
—
0.3
VCC = VTH (minimum).,
ISINK = 1.2 mA, MIC809R/S/T
—
—
0.3
—
—
0.3
VCC = 1V, ISINK = 50 μA,
TA = –40°C to +85°C (SC-70)
—
—
0.3
VCC > 1.6V, ISINK = 50 μA,
TA = –40°C to +85°C
0.8 x
VCC
—
—
—
—
0.4
—
—
0.3
V
V
V
V
Conditions
ISOURCE = 800 μA, MIC809L/M/J
VCC > 1.4V, ISINK = 50 μA,
TA = 0°C to +70°C
1.8V < VCC < VTH (minimum),
ISOURCE = 150 μA
ISINK = 3.2 mA, MIC810L/M/J
ISINK = 1.2 mA, MIC810R/S/T
Specification for packaged product only.
Reset Timing Diagram
DS20006707A-page 4
2022 Microchip Technology Inc. and its subsidiaries
MIC809/MIC810
TEMPERATURE SPECIFICATIONS
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
Operating Temperature Range
TA
–40
—
+85
°C
Storage Temperature Range
TS
–65
—
+150
°C
—
Lead Temperature
—
—
—
+300
°C
Soldering, 10 sec.
Temperature Ranges
Note 1:
Note 1
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable
junction temperature and the thermal resistance from junction to air (i.e., TA, TJ, JA). Exceeding the
maximum allowable power dissipation will cause the device operating junction temperature to exceed the
maximum +85°C rating. Sustained junction temperatures above +85°C can impact the device reliability.
2022 Microchip Technology Inc. and its subsidiaries
DS20006707A-page 5
MIC809/MIC810
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin Number
MIC809
Pin Number
MIC810
Pin Name
1
1
GND
2
N/A
/RESET
/RESET goes low if VCC falls below the reset threshold and remains
asserted for one reset timeout period (140 ms min.) after VCC exceeds
the reset threshold.
N/A
2
RESET
RESET goes high if VCC falls below the reset threshold and remains
asserted for one reset timeout period (140 ms min.) after VCC exceeds
the reset threshold.
3
3
VCC
DS20006707A-page 6
Description
IC Ground Pin.
Power Supply Input.
2022 Microchip Technology Inc. and its subsidiaries
MIC809/MIC810
3.0
APPLICATION INFORMATION
3.1
Microprocessor Reset
The /RESET (or RESET) pin is asserted whenever VCC
falls below the reset threshold voltage. The /RESET pin
remains asserted for a period of 140 ms after VCC has
risen above the reset threshold voltage. The reset
function ensures that the microprocessor is properly
reset and powers up in a known condition after a power
failure. /RESET will remain valid with VCC as low as
1.4V for the SOT-23 package and as low as 1V for the
SC-70 package.
3.2
3.4
/RESET Valid at Low Voltage
A resistor can be added from the /RESET pin to ground
to ensure the /RESET output remains low with VCC
down to 0V. A 100 kΩ resistor connected from the
/RESET to ground is recommended. The value of the
resistor should be small enough to pull-down any stray
leakage currents and large enough not to load the reset
output.
VCC Transients
The MIC809/810 are relatively immune to
negative-going VCC glitches below the reset threshold.
Typically, a negative-going transient 125 mV below the
reset threshold with a duration of 2 μs or less (SC-70
package) will not cause a reset.
3.3
Interfacing to Bidirectional Reset
Pins
The MIC809/810 can interface with microprocessors
with bidirectional reset pins by connecting a 4.7 kΩ
resistor in series with the MIC809/810 output and the
microprocessor reset pin.
2022 Microchip Technology Inc. and its subsidiaries
FIGURE 3-1:
Reset Valid to VCC = 0V.
DS20006707A-page 7
MIC809/MIC810
4.0
PACKAGING INFORMATION
4.1
Package Marking Information
3-Lead SOT-23*
(Front)
Example
3-Lead SOT-23*
(Back)
Example
MNNN
4R1S
Example
3-Lead SC-70*
(Back)
Example
JT
NNN
JA9
XX
IR
3-Lead SC-70*
(Front)
XX
Legend: XX...X
Y
YY
WW
NNN
e3
*
Product code or customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC® designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
●, ▲, ▼ Pin one index is identified by a dot, delta up, or delta down (triangle
mark).
Note:
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information. Package may or may not include
the corporate logo.
Underbar (_) and/or Overbar (‾) symbol may not be to scale.
TABLE 4-1:
MARKING CODES
SOT-23 Part Number
SC-70 Part Number
Marking Code
Threshold Voltage
MIC809LUY
MIC809LYC3
IL
4.63V
MIC809MUY
MIC809MYC3
IM
4.38V
MIC809JUY
MIC809JYC3
IJ
4.00V
MIC809TUY
MIC809TYC3
IT
3.08V
MIC809SUY
MIC809SYC3
IS
2.93V
MIC809RUY
MIC809RYC3
IR
2.63V
MIC810LUY
MIC810LYC3
JL
4.63V
MIC810MUY
MIC810MYC3
JM
4.38V
MIC810JUY
MIC810JYC3
JJ
4.00V
MIC810TUY
MIC810TYC3
JT
3.08V
MIC810SUY
MIC810SYC3
JS
2.93V
MIC810RUY
MIC810RYC3
JR
2.63V
DS20006707A-page 8
2022 Microchip Technology Inc. and its subsidiaries
MIC809/MIC810
3-Lead SOT-23 Package Outline and Recommended Land Pattern
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging.
2022 Microchip Technology Inc. and its subsidiaries
DS20006707A-page 9
MIC809/MIC810
3-Lead SC-70 Package Outline and Recommended Land Pattern
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging.
DS20006707A-page 10
2022 Microchip Technology Inc. and its subsidiaries
MIC809/MIC810
APPENDIX A:
REVISION HISTORY
Revision A (August 2022)
• Converted Micrel document MIC809/MIC810 to
Microchip data sheet template DS20006707A.
• Minor grammatical text changes throughout.
2022 Microchip Technology Inc. and its subsidiaries
DS20006707A-page 11
MIC809/MIC810
NOTES:
DS20006707A-page 12
2022 Microchip Technology Inc. and its subsidiaries
MIC809/MIC810
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office.
Examples:
MIC809LUY-TR
DEVICE
MIC809: Microprocessor Reset
Circuit with Active-Low /RESET
MIC810: Microprocessor Reset
Circuit with Active-High RESET
THRESHOLD PACKAGE TEMP. RANGE MEDIA TYPE
U = 3-Lead Y = –40°C to +85°C TR = 3,000/Reel
VOLTAGE
DEVICE
THRESHOLD
VOLTAGE
R = 2.63V
S = 2.93V
T = 3.08V
J = 4.00V
M = 4.38V
L = 4.63V
MIC809, 2.63V Threshold
Voltage, 3-Lead SOT-23,
–40°C to +85°C Temp.
Range, 3,000/Reel
b) MIC809JYC3-TR:
MIC809, 4.00V Threshold
Voltage, 3-Lead SC-70,
–40°C to +85°C Temp.
Range, 3,000/Reel
c) MIC809TUY-TR:
MIC809, 3.08V Threshold
Voltage, 3-Lead SOT-23,
–40°C to +85°C Temp.
Range, 3,000/Reel
d) MIC810SYC3-TR:
MIC810, 2.93V Threshold
Voltage, 3-Lead SC-70,
–40°C to +85°C Temp.
Range, 3,000/Reel
e) MIC810LUY-TR:
MIC810, 4.63V Threshold
Voltage, 3-Lead SOT-23,
–40°C to +85°C Temp.
Range, 3,000/Reel
f) MIC810MYC3-TR:
MIC810, 4.38V Threshold
Voltage, 3-Lead SC-70,
–40°C to +85°C Temp.
Range, 3,000/Reel
SOT-23
R = 2.63V
S = 2.93V
T = 3.08V
J = 4.00V
M = 4.38V
L = 4.63V
MIC810LYC3-TR
MIC809: Microprocessor Reset
Circuit with Active-Low /RESET
MIC810: Microprocessor Reset
Circuit with Active-High RESET
a) MIC809RUY-TR:
PACKAGE
MEDIA TYPE
C3 = 4-Lead
SC-70
Y = –40°C to +85°C
TR = 3,000/Reel
TEMP.
RANGE
Note 1:
2022 Microchip Technology Inc. and its subsidiaries
Tape and Reel identifier only appears in the
catalog part number description. This identifier is
used for ordering purposes and is not printed on
the device package. Check with your Microchip
Sales Office for package availability with the
Tape and Reel option.
DS20006707A-page 13
MIC809/MIC810
NOTES:
DS20006707A-page 14
2022 Microchip Technology Inc. and its subsidiaries
Note the following details of the code protection feature on Microchip products:
•
Microchip products meet the specifications contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is secure when used in the intended manner, within operating specifications, and
under normal conditions.
•
Microchip values and aggressively protects its intellectual property rights. Attempts to breach the code protection features of
Microchip product is strictly prohibited and may violate the Digital Millennium Copyright Act.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of its code. Code protection does not
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This publication and the information herein may be used only
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DS20006707A-page 15
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09/14/21
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